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Partners' Capital and Distributions - Issuance of Series B Preferred Units (Details) - Series B Preferred Units - USD ($)
$ / shares in Units, $ in Millions
Nov. 15, 2017
Oct. 10, 2017
Nov. 15, 2022
Forecast      
Class of Stock [Line Items]      
Percentage spread on top of LIBOR for distribution     4.11%
Initial prorated distribution per unit (in dollars per unit) $ 5.9549    
Total distribution amount $ 5    
Redemption price per unit     $ 1,000
Subsequent event      
Class of Stock [Line Items]      
Units issued (in units)   800,000  
Price per unit issued (in dollars per unit)   $ 1,000  
Proceeds from issuance of units   $ 788  
Liquidation preference (in dollars per unit)   $ 1,000  
Distribution rate percentage   6.125%  
Distribution rate per unit   $ 61.25  
Redemption price per unit   $ 1,020  
Redemption price percentage   102.00%